Assuming Versus stays exclusive, losing exclusivity of FFXIII may not impact the ps3 that much. Square has stated multiple times that BOTH titles are the core of the FFXIII universe, and Versus is being made by the KH/TWEWY team, so the game will be excellent (possibly even better than FFXIII), and should sell around as much as FFXIII on the ps3. Any major FF fan (or anyone who'd buy a system primarily for FF) should in theory still buy a ps3 for Versus.
The only variable is how long after FFXIII Versus comes out. If it comes out well over a year later, it's significance will be lessened greatly, imo.







